How does the display bounds change during scrolling in a ScrollView component?

In the UIScrollView component, the display area (bounds) changes automatically when scrolling the content. When the user scrolls, the contentOffset property changes, which leads to a change in bounds.origin of the UIScrollView.

In fact, scrolling is implemented by shifting the display area within the UIScrollView itself. When contentOffset changes, the start of the bounds area shifts, causing the visual content to move.

Example:

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    print("contentOffset: \(scrollView.contentOffset)")
    print("bounds.origin: \(scrollView.bounds.origin)")
}

Here, it is visible that bounds.origin matches contentOffset, and this shift is responsible for scrolling.